Electrochemical impedance spectroscopy investigations on glassy carbon electrodes modified with poly(4-azulen-1-yl-2,6-bis(2-thienyl)pyridine)

Abstract

A characterization of glassy carbon (GC) electrodes modified by controlled potential electrolysis of 4-azulen-1-yl-2,6-bis(2-thienyl)pyridine (L) in acetonitrile solutions containing tetra-n-butylammonium perchlorate is presented. The electrochemical properties of bare and modified GC electrodes were investigated by electrochemical impedance spectroscopy (EIS) in acetate buffer solutions. EIS data were fitted using the Zview fitting program and the appropriate equivalent electrical circuit. Small variations in the electrochemical properties of the interface during the steps of preparation of the modified electrodes with polyL films were observed. The EIS parameters of the polyL film have no regular variation with the increase in film thickness, most probably due to significant effect of polyL films porosity.